"Mumford & Daughters": That's how Conan O'Brien describes Atlanta-based Americana quartet von Grey. The four teenage sisters — Kathryn, 19, Annika, 18, Fiona, 16, and Petra, 14 — have been raking in praises for their pristine harmonies and precise instrumentation. They and their managers (aka Mom and Dad) have been busy touring, playing Late Show withDavid Letterman and opening for Indigo Girls, Sarah McLachlan and Lindsey Stirling. The group's six-song debut EP, Awakening, arrived in January.

Early inspiration: When the kids were young(er), they lived in India for several months. All classically trained musicians, the girls began dabbling in Celtic and bluegrass and playing with Indian musicians who played Western rock. When they returned to Atlanta, the girls started writing their own brand of Americana and rock.

What about school? The von Grey sisters are as tight-knit as the von Trapp kids. They're homeschooled, studying in their van in between gigs. Even when they do have time off from each other, they hang out together. How do they not kill each other in such close quarters? "We've always been homeschooled, so we're used to each other," says Annika.

USA TODAY's Korina Lopez talks with Annika von Grey of the group Von Grey after a session with StudioA.
USA TODAY